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I would argue that the urban and third world poor also contribute little, so it may be more of a bell curve than a straight line.

You've obviously never worked with Mexicans or other nationalities that show up looking for something to do to feed their families. I worked a stope in Butte in the late 50's that had everything from Wetbacks to US born Mexican-Americans on our crew - they were very conscientious but needed me to stand up to the gringos. What used to pizz the white miners off was the fact that week after week this bunch of Mexicans with a smart assed anti union white kid topped the board at our mine on a routine basis. Lots of contracts & not easy to do.